[throwaway2048]

its trivial to add, yet hasn't been added in almost 15 years, it is very much a title text search and nothing about this move indicates otherwise.

there is no economic interest from google to make ad free apps actually findable, and no chance somebody making a better play store is going to usurp their position.

[handrous]

Even Apple doesn't have a "show only actually-free" toggle on their store for free apps with no IAP and no ads. Which sucks.